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704 MHz cavity folded tuner Thermal Analysis C. Pai

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Presentation on theme: "704 MHz cavity folded tuner Thermal Analysis C. Pai"— Presentation transcript:

1 704 MHz cavity folded tuner Thermal Analysis C. Pai 4-20-2016

2 Meeting Minutes 4/20/2016 Zaltsman, Alexander ; Pai, Chien-Ih ; Brennan, Joseph ; Brutus, Jean Clifford ; Xiao, Binping ; Fedotov, Alexei ; Grau, Manuel Results look very good, we can live with the localized higher temperature. Assumption of 50% thread was very conservative and may cause the higher temperature rise in the model. It was agreed that no further thermal analysis is needed unless there is some other change in the RF design or results. Cliff is going to look into modifying/manufacturing tuner from the cold model to be adaptable to the factory acceptance tests. Binping will run the simulations to see if the reduction of the gap indeed significantly reduces the power dissipated in the tuner. Do want to reduce the lateral gaps between the tuner elements from 3mm to 2 mm. This will allow the copper cup to be thicker which will reduce temperature, again unless something else changes, there is no need for further temperature analysis. Question for Mike and Binping: Will changing from 3 mm to 2 mm gaps require further RF analysis? Because of the reduced gap clearance, Cliff was requested to verify what the catalog accuracy of the Kurt Lesker drive means “2mm at 1 meter”. Requested Cliff to develop a simplified geometric representation of the possible tracking error in the drive system and verify that 1 mm and 2 mm clearance is okay. Hold a short review meeting. Manny’s next priority is to do an ECN on the 704 cavity to extend the tuner flange. Overall design priorities in order for Manny: 1. ECN for 704 tuner flange location 2. Complete 2.1 GHz tuner assembly fabrication drawings after they have been checked (drawings have been submitted for checking). 3. Complete 704 MHz tuner assembly model with Kurt Lesker vacuum drive assembly and adapter flange (hold a design review and approval). 4. Complete 704 MHz tuner assembly fabrication drawings and submit for checking. 5. Complete 2.1 GHz support and stand assembly. 6. Complete 2.1 GHz vacuum transitions, ion pump support, and installation drawings. By time item 5 is underway Sal Picataggio may be available to do items 5 and 6 for the 704 MHz cavity.

3 704 MHz Cavity with folded tuner, Based on “ 704M_v7_704MHzv2_chokeTuner.stp”

4 4 2.1 GHz cavity tuner

5 704 MHz Tuner conceptual design Cap Water shaft Cuff Tube

6 6 1.94” Tuner port length may need extension 2.1 GHz tuner 704 MHz tuner

7 0 mm +12mm-6 mm Tuner position

8 Integral model for FE analysis Assume 50% contact between both threads and contact interfaces Convection surface Water flow rate 10 gpm T water : 35 o C (avg. Inlet: 30 o C, Outlet: 40 o C) T Room : 35 o C V of water: 2.3 m/s H coefficient: 13,000 W/m 2 C

9 Electrical field plot (normalized) when tuner at +12 mm position Frequency: 704.863811 MHz Q-factor : 33066.5845 Surface loss=: 0.753075E-09 W

10 E field along beam line Gap voltage: EMF along beam line = 0.103469837 V (normalized) Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6

11 Magnetic field plot (normalized) when tuner at +12 mm position Frequency: 704.863811 MHz Q-factor : 33066.5845 Surface loss=: 0.753075E-09 W

12 Magnetic field plot (normalized) when tuner at +12 mm position Viewed with tuner port

13 Magnetic field plot (normalized) when tuner at +12 mm position Viewed from port corner

14 Heat Flux distribution on cavity surface loss (normalized RF calculation) Surface loss from normalized model=0.753075E-09 W Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6 Scale factor based on surface quality =1.3 Heat flux scaled up factor =(6.239x10 6 ) 2 x1.3 =5.061x10 13 Total Scaled up Heat loss =38.1137 KW

15 Heat Flux distribution on cavity surface loss (normalized RF calculation) View from inside Total Scaled up Heat loss =38.1137 KW

16 Heat Flux distribution on tuner surface loss (normalized RF calculation) Surface loss=0.515045E-10 W Total Scaled up Heat loss In tuner =2.6067 KW Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6 Scale factor based on surface quality =1.3 Heat flux scaled up factor =(6.239x10 6 ) 2 x1.3 =5.061x10 13

17 Heat Flux distribution on tuner surface loss (normalized RF calculation) Surface loss=0.515045E-10 W Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6 Scale factor based on surface quality =1.3 Heat flux scaled up factor =(6.239x10 6 ) 2 x1.3 =5.061x10 13 Total Scaled up Heat loss In tuner =2.6067 KW

18 Heat Flux distribution on cuff surface loss (normalized RF calculation) Surface loss=0.489222E-12 W Total Scaled up Heat loss In cuff =.02476 KW Scale factor based on surface quality =1.3 Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6 Heat flux scaled up factor =(6.239x10 6 ) 2 x1.3 =5.061x10 13

19 Heat Flux distribution on cuff surface loss (normalized RF calculation) Surface loss=0.489222E-12 W Scale factor based on surface quality =1.3 Total Scaled up Heat loss In cuff =.02476 KW Scale factor based on V: 645.6KV/0.103469837 V =6.239x10 6 Heat flux scaled up factor =(6.239x10 6 ) 2 x1.3 =5.061x10 13

20 Temperature distribution of water cooled tuner Max. T: 124.68 o C tip of tuner skirt Water flow rate 10 gpm T water : 35 o C (avg) H: 13,000 W/m 2 C Total heat input: 2.6067 KW oCoC

21 Temperature distribution of tuner cap Max. T: 124.68 o C At tip of tuner skirt oCoC

22 Temperature distribution of water shaft Max. T: 89.58 o C At top of contact surface oCoC

23 RF results: (normalized value) Frequency: 704.863811 MHz Q-factor = 33066.5845 Surface loss=0.753075E-09 W Gap voltage along beam line = 0.103469837 V (normalized) Scale factor from E field: 645.6KV/0.103469837V =6.239x10 6 Scale factor due to surface quality =1.3 Total Scaled up factor for heat loss (6.239x10 6 ) 2 x1.3 =5.061x10 13 Total Heat Loss= 38.1137 KW Summaries: (Tuner at +12 mm) 23

24 Thermal Results: Total Scaled up Heat in whole cavity = 38.1137 KW Heat loss in body: 35.4823 KW Heat loss in tuner: 2.6067 KW Heat loss in cuff:.0247 KW Water flow rate in tuner: 10 gpm T water : 35 o C (avg. of inlet: 30 o C, outlet: 40 o C) T Room : 35 o C V of water: 2.3 m/s H coefficient: 13,000 W/m 2 C Max. T in the tuner : 124.68 o C At tip of tuner skirt (cap) : 89.58 o C At top of contact surface (water shaft) Summaries (cont.): 24

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